litestream

defmodule Litestream.Strategy.Tigris do
  @moduledoc """
  Use this strategy for backing up your SQLite DB file to
  Fly's Tigris Object storage.
  """

  alias __MODULE__
  alias Litestream.Replicator

  @type t :: %Tigris{
          access_key_id: String.t(),
          secret_access_key: String.t(),
          bucket: String.t()
        }

  @keys [:access_key_id, :secret_access_key, :bucket]
  @enforce_keys @keys
  defstruct @keys

  defimpl Replicator do
    def env_vars(%Tigris{access_key_id: access_key_id, secret_access_key: secret_access_key}) do
      [
        {"AWS_ACCESS_KEY_ID", access_key_id},
        {"AWS_SECRET_ACCESS_KEY", secret_access_key}
      ]
    end

    def cli_args(%Tigris{bucket: bucket}, database) do
      uri = %URI{
        scheme: "s3",
        host: bucket,
        query: [
          region: "auto",
          endpoint: "fly.storage.tigris.dev"
        ]
      }

      [database, URI.to_string(uri)]
    end

    def temp_file_contents(_struct, _database) do
      nil
    end
  end
end